To provide a radiation imaging apparatus which is capable of both connecting state radiographing for radiographing with a C arm connected and non-connecting state radiographing for radiographing with the C arm disconnected, and is convenient and obtains high quality images, the apparatus includes: a flat panel detector; a holding unit for holding at least the flat panel detector; and a control unit for controlling the flat panel detector. With the configuration, the flat panel detector can be connected to and disconnected from the holding unit; connecting state radiographing can be performed with the flat panel detector connected to the holding unit, and non-connecting state radiographing can be performed with the flat panel detector disconnected from the holding unit; the control unit controls the flat panel detector such that a heat generation quantity of the flat panel detector during the non-connecting state radiographing can be lower than a heat generation quantity of the flat panel detector during the connecting state radiographing.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A radiation imaging apparatus, comprising; a flat panel detector including picture elements arranged in a matrix of rows and columns on a substrate, each picture element having a conversion element for converting radiation into an electrical signal, a signal wiring connected to the picture elements in a column, and a read-out circuit unit connected to the signal wiring; a holding unit for holding said flat panel detector; and a control unit for controlling said flat panel detector, wherein said flat panel detector can be connected to and disconnected from said holding unit, and wherein connecting state radiographing can be performed with the flat panel detector connected to the holding unit, and non-connecting state radiographing can be performed with the flat panel detector disconnected from the holding unit, and wherein said control unit controls said flat panel detector so that a power supply voltage applied to said read-out circuit unit in the non-connecting state radiographing is lower than that of applied to said read-out circuit unit in the connecting state radiographing, and so that a change in characteristics of said read-out circuit unit due to a change of the power supply voltage is compensated for.
2. The radiation imaging apparatus according to claim 1 , wherein said read-out circuit unit includes integrating circuit which has an operational amplifier and a capacitor for defining a gain of the operational amplifier, and said control unit controls the power supply voltage and the gain in the connecting state radiographing and the non-connecting state radiographing.
3. The radiation imaging apparatus according to claim 1 , wherein the flat panel detector comprises a heat dissipation transmission unit for transmitting generated heat to the holding unit and dissipating heat in a state in which the detector is connected to the holding unit.
4. The radiation imaging apparatus according to claim 1 , wherein the flat panel detector can perform moving image radiographing and still image radiographing in the connecting state radiographing, and can perform idling drive and still-image radiographing in the non-connecting state radiographing.
5. The radiation imaging apparatus according to claim 1 , further comprising a connection detector for detecting whether or not said flat panel detector is connected to said holding unit, wherein said control unit controls said flat panel detector according to result of detection by the connection detector.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 12, 2009
July 6, 2010
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